<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <button @click="msg='你好'">设置msg</button>
        <!-- 表单元素 -->
        <input type="text" v-model="msg" >
        <p>{{ msg }}</p>

        <!-- 无效，因为div不是表单元素 -->
        <!-- <div v-model="msg">我是内容</div> -->
    </div>

    <script src="./vue.js"></script>
    <script>
        new Vue({
            el: '#app',
            data: {
                msg: ''
            }
        })
    </script>
</body>
</html>